UL 60950-1
Information Technology Equipment - Safety - Part 1: General Requirements

Edition Number:2SCC Approved:--
Edition Date:2007-03-27DOD Approved: 1994-12-21
Price Code:GANSI Approved: 2019-05-09


    1.1 Scope

    1.1.1 Equipment covered by this standard

    This standard is applicable to mains-powered or battery-powered information technology equipment, including electrical business equipment and associated equipment, with a RATED VOLTAGE not exceeding 600 V and designed to be installed in accordance with the Canadian Electrical Code, Part I, CSA C22.1-12; General Requirements – Canadian Electrical Code, Part II, CSA C22.2 No. 0-10; the National Electrical Code, NFPA 70-2014; and the National Electrical Safety Code, IEEE C2-2012.

    The standard is also applicable to equipment, unless otherwise identified by a marking or instructions, designed to be installed in accordance with Article 645 of the National Electrical Code, ANSI/NFPA 70, and the Standard for the Protection of Information Technology Equipment, NFPA 75-2013.

    See Annex nae for examples of and references to regulatory requirements that apply to this equipment.

    This standard is also applicable to such information technology equipment:

    –    designed for use as telecommunication terminal equipment and TELECOMMUNICATION NETWORK infrastructure equipment, regardless of the source of power;

    –    designed and intended to be connected directly to, or used as infrastructure equipment in, a CABLE DISTRIBUTION SYSTEM, regardless of the source of power;

    –    designed to use the AC MAINS SUPPLY as a communication transmission medium (see Clause 6, Note 4 and 7.1, Note 4).

    This part of IEC 60950 is also applicable to:

    –    components and subassemblies intended for incorporation in this equipment. Such components and subassemblies need not comply with every requirement of the standard, provided that the complete equipment, incorporating such components and subassemblies, does comply;

    –    external power supply units intended to supply other equipment within the scope of this part of IEC 60950;

    –    accessories intended to be used with equipment within the scope of this part of IEC 60950.

    NOTE 1 Examples of aspects with which uninstalled components, subassemblies, and accessories may not comply include the marking of the power rating and access to hazardous parts.

    NOTE 2 This standard may be applied to the electronic parts of equipment even if that equipment does not wholly fall within its Scope, such as large-scale air conditioning systems, fire detection systems and fire extinguishing systems. Different requirements may be necessary for some applications.

    This standard specifies requirements intended to reduce risks of fire, electric shock or injury for the OPERATOR and layman who may come into contact with the equipment and, where specifically stated, for a SERVICE PERSON.

    This standard also specifies requirements intended to reduce risks from acoustic outputs at communication receivers and similar devices used for voice telecommunication, regardless of transmission medium (e.g., TELECOMMUNICATION NETWORK, CABLE DISTRIBUTION NETWORK, wireless network). See Annex nad.

    This standard is intended to reduce such risks with respect to installed equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the equipment in the manner prescribed by the manufacturer.

    Examples of equipment that is in the scope of this standard are:

    Generic product type

    Specific example of generic type

    banking equipment

    monetary processing machines including automated teller (cash dispensing) machines (ATM)

    data and text processing machines and associated equipment

    data preparation equipment, data processing equipment, data storage equipment, personal computers, plotters, printers, scanners, text processing equipment, visual display units

    data network equipment

    bridges, data circuit terminating equipment, data terminal equipment, routers

    electrical and electronic retail equipment

    cash registers, point of sale terminals including associated electronic scales

    electrical and electronic office machines

    calculators, copying machines, dictation equipment, document shredding machines, duplicators, erasers, micrographic office equipment, motor-operated files, paper trimmers (punchers, cutting machines, separators), paper jogging machines, pencil sharpeners, staplers, typewriters

    other information technology equipment

    photoprinting equipment, public information terminals, multimedia equipment

    postage equipment

    mail processing machines, postage machines

    telecommunication network infrastructure equipment

    billing equipment, multiplexers, network powering equipment, network terminating equipment, radio basestations, repeaters, transmission equipment, telecommunication switching equipment

    telecommunication terminal equipment

    facsimile equipment, key telephone systems, modems, PABXs, pagers, telephone answering machines, telephone sets (wired and wireless)

    NOTE 3 The requirements of IEC 60065 may also be used to meet safety requirements for multimedia equipment. See IEC Guide 112,  Guide on the safety of multimedia equipment.

    This list is not intended to be comprehensive, and equipment that is not listed is not necessarily excluded from the scope.

    Equipment complying with the relevant requirements in this standard is considered suitable for use with process control equipment, automatic test equipment and similar systems requiring information processing facilities. However, this standard does not include requirements for performance or functional characteristics of equipment.

    1.1.2 Additional requirements

    Requirements additional to those specified in this standard may be necessary for:

    –    equipment intended for operation in special environments (for example, extremes of temperature; excessive dust, moisture or vibration; flammable gases; and corrosive or explosive atmospheres);

    –    electromedical applications with physical connections to the patient;

    –    equipment intended to be used in vehicles, on board ships or aircraft, in tropical countries, or at altitudes greater than 2 000 m;

    –    equipment intended for use where ingress of water is possible; for guidance on such requirements and on relevant testing, see Annex t.

    NOTE Attention is drawn to the fact that authorities of some countries impose additional requirements.

    1.1.3 Exclusions

    This standard does not apply to:

    –    power supply systems which are not an integral part of the equipment, such as motor-generator sets, battery backup systems and distribution transformers;

    –    building installation wiring;

    –    devices requiring no electric power.

    Battery backup systems that are not an integral part of STATIONARY EQUIPMENT, such as provided in separate cabinets, are subjected to the appropriate standard for the battery backup systems, such as the Standard for Batteries for Use in Light Electric Rail (LER) Applications and Stationary Applications, UL 1973.

    NOTE See Figures 1.1 and 1.2 of UL 1973 for more information on independent electric energy storage systems (EESS) covered by UL 1973, which can consist of both low voltage and hazardous voltage subsystems, battery management, thermal management, and related features and safeguards. When interconnected with AV, IT and CT Equipment, and typically used in conjunction with an uninterruptible power supply (UPS), such EESS typically serve as short term substitution of the mains supply during power outages and similar disturbances.

    Expand All

    • Cover
    • Transmittal
    • UL/CSA Title Page
    • Table of Contents
    • UL Preface
    • IEC Foreword
    • IEC Introduction
      • INFORMATION TECHNOLOGY EQUIPMENT – SAFETY – Part 1: General Requirements
        • 1 General
          • 1.1 Scope
          • 1.2 Definitions
          • 1.3 General requirements
          • 1.4 General conditions for tests
          • 1.5 Components
          • 1.6 Power interface
          • 1.7 Markings and instructions
        • 2 Protection from hazards
          • 2.1 Protection from electric shock and energy hazards
          • 2.2 SELV circuits
          • 2.3 TNV circuits
          • 2.4 Limited current circuits
          • 2.5 Limited power sources
          • 2.6 Provisions for earthing and bonding
          • 2.7 Overcurrent and earth fault protection in primary circuits
          • 2.8 Safety interlocks
          • 2.9 Electrical insulation
          • 2.10 Clearances, creepage distances and distances through insulation
        • 3 Wiring, connections and supply
          • 3.1 General
          • 3.2 Connection to a mains supply
          • 3.3 Wiring terminals for connection of external conductors
          • 3.4 Disconnection from the mains supply
          • 3.5 Interconnection of equipment
        • 4 Physical requirements
          • 4.1 Stability
          • 4.2 Mechanical strength
          • 4.3 Design and construction
          • 4.4 Protection against hazardous moving parts
          • 4.5 Thermal requirements
          • 4.6 Openings in enclosures
          • 4.7 Resistance to fire
        • 5 Electrical requirements and simulated abnormal conditions
          • 5.1 Touch current and protective conductor current
          • 5.2 Electric strength
          • 5.3 Abnormal operating and fault conditions
        • 6 Connection to telecommunication networks
          • 6.1 Protection of telecommunication network service persons, and users of other equipment connected to the network, from hazards in the equipment
          • 6.2 Protection of equipment users from overvoltages on telecommunication networks
          • 6.3 Protection of the telecommunication wiring system from overheating
          • 6.4 Protection against overvoltage from power line crosses
        • 7 Connection to cable distribution systems
          • 7.1 General
          • 7.2 Protection of cable distribution system service persons, and users of other equipment connected to the system, from hazardous voltages in the equipment
          • 7.3 Protection of equipment users from overvoltages on the cable distribution system
          • 7.4 Insulation between primary circuits and cable distribution systems
    • Annex A(normative)Tests for resistance to heat and fire
    • Annex B(normative)Motor tests under abnormal conditions(see and )
    • Annex C(normative)Transformers(see and )
    • Annex D (normative) Measuring instruments for touch-current tests (see )
    • Annex E (normative) Temperature rise of a winding (see )
    • Annex F (normative) Measurement of clearances and creepage distances (see and Annex )
    • Annex G (normative) Alternative method for determining minimum clearances
    • Annex H (normative) Ionizing radiation (see )
    • Annex J (normative) Table of electrochemical potentials (see )
    • Annex K (normative) Thermal controls (see and )
    • Annex L(normative)Normal load conditions for some types of electrical business equipment(see and )
    • Annex M(normative)Criteria for telephone ringing and other signals (see )
    • Annex N (normative) Impulse test generators (see , , , , , and Clause )
    • Annex P(normative) Normative references
    • Annex Q(normative) Voltage dependent resistors (VDRs)(see )
    • Annex R (informative) Examples of requirements for quality control programmes
    • Annex S (informative) Procedure for impulse testing (see )
    • Annex T(informative) Guidance on protection against ingress of water (see )
    • Annex U(normative) Insulated winding wires for use without interleaved insulation (see )
    • Annex V (normative) A.C. power distribution systems (see )
    • Annex W(informative) Summation of touch currents
    • Annex X (informative) Maximum heating effect in transformer tests (see Clause )
    • Annex Y(normative) Ultraviolet light conditioning test (see )
    • Annex Z(informative)Overvoltage categories (see and Clause )
    • Annex AA(normative)Mandrel test(see )
    • Annex BB (informative)Changes in the second edition
    • Annex CC(normative)Evaluation of integrated circuit (IC) current limiters
    • Annex DD(normative)Requirements for the mounting means of rack-mounted equipment
    • Annex EE(normative)Household and home/office document/media shredders
    • Bibliography
    • Annex NAA(normative) Markings and instructions
    • Annex NAB(informative) D.C. powered equipment and centralized d.c. power systems (see )
    • Annex NAC(normative) Power line crosses (see )
    • Annex NAD(normative)Acoustic tests
    • Annex NAE(informative) U.S. and Canadian regulatory requirements
    • Annex NAFDeleted
    • INDEX